git: update to v2.15.1

Update to git version v2.15.1: With commit 0abe14f6 prepare_packed_git()
moved to packfile.[ch].

Signed-off-by: Christian Hesse <mail@eworm.de>
Reviewed-by: John Keeping <john@keeping.me.uk>

Makefile

@@ -14,7 +14,7 @@ htmldir = $(docdir)
 pdfdir = $(docdir)
 mandir = $(prefix)/share/man
 SHA1_HEADER = <openssl/sha.h>
-GIT_VER = 2.14.0
+GIT_VER = 2.15.1
 GIT_URL = https://www.kernel.org/pub/software/scm/git/git-$(GIT_VER).tar.gz
 INSTALL = install
 COPYTREE = cp -r

git

@@ -1 +1 @@
-Subproject commit 4384e3cde2ce8ecd194202e171ae16333d241326
+Subproject commit 9b185bef0c15cec1ea8753ce091e42ea041f2c31

ui-clone.c

@@ -11,6 +11,7 @@
 #include "ui-clone.h"
 #include "html.h"
 #include "ui-shared.h"
+#include "packfile.h"
 
 static int print_ref_info(const char *refname, const struct object_id *oid,
                           int flags, void *cb_data)